Sony CFD-S38 / CFD-S55 Service Manual ▷ View online
– 13 –
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.6 ± 0.4 V
4.0 ± 0.1V
Adjustment Part
<confirmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
AM FREQUENCY COVERAGE
CHECK
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.0
+ 0.7 V
4.8
+ 1.2V
– 0.5 V
– 0.6 V
Adjustment Part
<confirmation> <confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
620 kHz
1,400 kHz
• For AM adjustment, fix the ferrite-rod antenna (L3) as shown
below and then perform tracking adjustment at L4 and CT3.
Lastly check the voltage.
Lastly check the voltage.
digital
voltmeter
voltmeter
100 k
Ω
TP (VT)
(JW17)
(JW17)
2
jack (J301)
set
32
Ω
level meter
(range: 0.5–5 V ac)
(range: 0.5–5 V ac)
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
TP (FM ANT)
FM RF signal
generator
generator
0.01
µ
F
set
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO (BAND) button: FM
RADIO (BAND) button: FM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
deviation by 1 kHz signal
output level : as low as possible
• AM Section
Setting:
RADIO (BAND) button: AM
RADIO (BAND) button: AM
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (FM and AM)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
3.0
±
1.0 mm
L3
AM
FERRITE-ROD
ANTENNA
AM
FERRITE-ROD
ANTENNA
Adjustment Location: See page 14.
– 14 –
TP (RFO)
– main board (conductor side) –
Adjustment Location:
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin #£ (TP RFO) and
GND on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the CD
3. Press the CD
fl button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
π
Test Point:
RF level :
1.2
1.2
±
0.1 Vp-p
VOLT/DIV : 200 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
L3
CT3
TP (VT)
(JW17)
TP
(FM ANT)
AM
TRACKING
ADJUSTMENT
L4
CT1
L1
FM
TRACKING
ADJUSTMENT
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
– tuner board (component side) –
– 15 –
6-1. IC PIN DESCRIPTION
• IC501 CXP83620-007Q (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
C-SCOR
I
CD SCOR input
2
RMC
I
Sircs receiver input
3, 4
NC
—
Not used.
5
C-SENS1
I
CD SENSE-1 input
6
C-SENS2
I
CD SENSE-2 input
7
C-SQCK
O
CD Sub-Q read clock output
8
C-SQSO
I
CD Sub-Q data input
9
C-RST
O
CD reset output
10
C-CLOCK
O
CD serial clock output
11
C-LATCH
O
CD serial latch output
12
C-DATA
O
CD serial data output
13
REC
I
Tape record signal input L: REC
14
R-COUNT
I
Tuner PLL data input
15
R-DATA
O
Tuner PLL data output
16
R-CLOCK
O
Tuner PLL clock output
17
R-LATCH
O
Tuner PLL latch output
18
V-LATCH
O
Volume latch output
19
V-DATA
O
Volume data output
20
V-CLOCK
O
Volume clock output
21
P-CON
O
System power control output
22
DIRECTION
—
Not used.
23 – 25
KEY-1 – 3
I
Key input
26
NC
—
Not used.
27
INIT
O
Initial set signal output
28
MODE CHECK
I
Mode set pin
29
SHIFT CLOCK
O
Shift clock output
30
RST
I
System reset input
31
EXTAL
I
Oscillation input (4.19 MHz)
32
XTAL
O
Oscillation output (4.19 MHz)
33
VSS
—
GND
34
VL
O
LCD drive port ON/OFF output
35 – 37
VLC-3 – 1
O
LCD drive voltage terminal
38 – 41
COM0 – 3
O
LCD drive common output
42 – 64
SEG0 – 22
O
LCD drive segment output
65
NC
—
Not used.
66
A-MUTE
O
Audio mute output H: Mute
67
B-MUTE
O
Tuner block mute output H: Mute
68
C-MUTE
O
CD block mute output H: Mute
69
TAPE
O
Tape function output H: Tape
70
RADIO
O
Tuner function output H: Radio
71
CD
O
CD function output L: CD
72
VDD
—
Power supply pin (+5 V)
73
TX
O
Oscillation output (32.768 kHz)
74
TEX
I
Oscillation input (32.768 kHz)
75
NC
—
Not used.
76
ISS1
O
Not used.
77
ISS2
O
Not used.
78
C-DOOR
I
CD door open/close switch input L: Close
79
TC-PLAY
I
Tape play switch input L: Tape
80
REG CHK
I
Regulator check signal input H: ON
SECTION 6
DIAGRAMS
– 16 –
6-2. CIRCUIT BOARDS LOCATION
TUNER board
HEADPHONE board
BATTERY board
BATTERY COMMON board
PRIMARY board
SECONDARY board
CONTROL board
MAIN board
CD MOTOR board
Click on the first or last page to see other CFD-S38 / CFD-S55 service manuals if exist.